Enabling Persistent Routes on a Debian Host

1. su to root

2. cd to /etc/network/

3. Copy off the interfaces file to interfaces.DATE (or what have you)

4. Add lines of the following form under the primary network interface definition:

up route add -net 10.1.1.0 netmask 255.255.255.0 gw 10.2.1.1

down route del -net 10.1.1.0 netmask 255.255.255.0

So you should end up with something like this:

iface bond0 inet static

address 10.2.1.5

netmask 255.255.255.0

network 10.2.1.0

gateway 10.2.1.1

up /sbin/ifenslave bond0 eth0

up /sbin/ifenslave bond0 eth2

up route add -net 10.1.1.0 netmask 255.255.255.0 gw 10.2.1.1

down route del -net 10.1.1.0 netmask 255.255.255.0

That creates a route to the 10.1.1.x network for the host with the ip 10.2.1.5 through the 10.2.1.1 router whenever the interface goes up. (It also removes it whenever the interface goes down.)